<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="jquery\jquery.js"></script>
</head>
<body>
    <div>
        number1：<input type="text" name="" id="number1">
        <br>
        number2：<input type="text" name="" id="number2">
        <hr>
        <button id="res">result</button>
        <input type="text" name="" id="result">
    </div>

    <script>
        $(document).ready(function(){
            $("#res").click(function(){
                // let num1=0,num2=0;
                num1=$("#number1").val();
                num2=$("#number2").val();
                $("#result").val(Number(num1)+Number(num2) );
                res=parseInt(num1)+parseInt(num2);
                alert(res);

            })
        })

       
    </script>
</body>
</html>